When working in a new theatre, always find out where the tielines go

The pictures will tell the story. It's a twin, unscreened stranded pair cable, of no use to audio. It starts here...

Continues here...

And ends here, just on the other side of the window...

What its purpose is remains a mystery, but it surely must be useful for something. Any ideas?

P.S. Did you want a close-up?

Curious. Rather more worrying is something else you might have have noticed in one of the photos...

It's a 230-volt mains cable with the live and neutral bare, and the earth cut back. I don't know about you but I'm getting out of here...!